Beat that for $45,000

I hope that is my 1966 Mustang that can be fit into a class as it is now built

My never ending R project

Yeah...where the h*** is my FWD 400HP Focus ST? :(

You choices only covers 10% of the cars out there.

26 year old miata, capable of sub 1:30s on Thunderbolt. 

S2000

I just wanted to clarify that when I picked "ultimate driving machine" I meant my Nissan Versa hatch.

Ill be happy with a V10

I vote early 90's honda easy to prepare and it hurts alot of feelings when you take take on those monster V8's on the track.

Power of an 8 cyl in a boosted 2.0 4 cyl. gets it done.  400rwhp @ 2900 lbs

If 8 cylinders is fun, then 10 is better but 12 is best. And maybe brakes would help.

how about a wrong-wheel-drive option? EF Hondas are a riot on the track.

I like my super cheap little integra. Can't get any cheaper or better than a car that cost $80 originally..... now its no longer an $80 car. I've probably put a little over 3k into it over the past year. Just so I could have a track toy and be safe. So far it's been a super fun little car at the track. 

The original its-not-a-miata... S2000

cheap c4's are perfect for this!

It is all about performance and style - not horsepower - for me!

Should put No Pistons. Yes we still exist (Rotray Engines)

When i arrived at the track with my G8 6.0 and i pulled the baby sit out of the back, i seen couple people chuckled and then i laughed too when i was passing them on the track :)))

All of the above...

How about Supcharged V6 + Brakes

:-)